Casper Weather Forecast

    • 46
    • 81

    Increasing Clouds

    • 56
    • 84

    Rain Showers Likely

    • 43
    • 77

    Breezy

    • 48
    • 77

    Partly Sunny

    • 44
    • 76

    Slight Chance Thunderstorms

    • 47
    • 80

    Mostly Sunny

Today 12 Sep Natrona County Lower Elevations

Mostly sunny in the Morning, then becoming partly cloudy. Highs around 80. East Winds around 10 Mph with Gusts up to 20 Mph, becoming southwest in the afternoon.

Tonight 12 Sep Natrona County Lower Elevations

Partly cloudy. Lows in the mid 40s. Northeast Winds 10 to 15 Mph with Gusts up to 30 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Casper Temperature Statistics

September Temperature

Casper, Natrona County International Airport (8.1 miles)

  • Lowest 9 September, 2026

    39.9 °F

  • Average September

    69.1 °F

  • Highest 5 September, 2026

    91.7 °F

Climate (2021–2026)

Casper, Natrona County International Airport (8.1 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    33.3 °F

  • Average 2021–2026

    47.7 °F

  • Average High 2021–2026

    61.6 °F
Get WillyWeather+ to remove ads